Arrangement of connections for dynamo-electric machines



I.R.CO0K. ARRANGEMENT 0F CONNECTIONS FOR D-YNAMO ELECTRIC MACHINES.

I APPLICATION FILED DEC. 15. I9I6.

1,387,470. I Patented Aug. 16, 1921.

WITNESSES: INVENTOR [414%. 7 Joe/ R. Coo/r BY W ATTORNEY UNITED STATESPATENT OFFICE.

JOEL n. 0001:, or winxrnsnune, PENNSYLVANIA, ASSIGNOR T0 WESTINGHOUSEnnnornrc a manurnc'runme COMPANY, A CORPORATION or PENNSYLVANIA.

AMANGEMENT 0T CONNECTIONS FOR DYNAMO-ELECTRIC MACHINES.

Specification of Letters Patent. Patentd Aug. 16 1921.

Application filed December 15,'1916. Serial No. 137,223.

To all whom it may concern Be it known that I, Joni. R. Coon, a c1t1-zen of the United States, and a resident ot Wilkinsburg, in the countyof Allegheny and State of Pennsylvania, have invented anewv and usefulImprovement in the Arrangement of Connections for Dynamo-ElectricMachines, of which the following is a specification.

My invention relates to an arrangement of connections fordynamo-electric machines, and it has ion its object to provide a novelarrangement of the conducting leads between the field-magnet andarmature windin of an electric motor whereb the circult relation betweenthe respectlve windings may readily be altered, as, for example when itis desired to reverse the direction t rotation of the motor.

Heretofore, it has been customary to bring the leads from the severalwindings to a point outside of the motor and to make such changes inthe-connections as are necessary by means of a suitable switch.According to my invention, I provide .an arrangement in which'the leadsbetween the armature and field-ma et windings are normally locatedwithin tfi: inclosing casing of the motor but in which the ends thereofiare adapted to be readily removed through an openin rovided in thecasing whenever it is esired to change the circuit relation between thewindings.

In the accompanying drawings, Figure 1 I is a view, partially in sectionand partially in end elevation, of an electric motor embodying myinvention; Fig. 2 is a fragmentary sectional view along the line I IIIof Fig. 1, and Fig. 3 is a diagrammatic view showing the circuitconnections of the motor of Fig.1.

The motor comprises a substantiall hollow cylindrical casing 1 withinwhich is located an annular magnetizable core member 2 and an armaturemember dthat is rotatablymounted in end bearing brackets 4 carried bythe casing 1. -The core member 2 is provided with polar projections 5upon which are mounted field-magnet coils 6. The armature?) is provided,at one end, with a commutator cylinder 7, and the front bearing bracket4 is provided with oppositely disposed brush holders 8 located adjacentto thedommutator cylinder 7. The brush holders 8 respectively ,ticmprisea hollow cyl ndrical member 9 of conducting material that is supportedin the bracket 4 by an insulatcore member 2 and the casing 1, for apurpose to behereinafterdescribed. A multiple conductor, cable 14 entersthe end bracket 4 and comprises conductors 15 which are connected to oneterminal of each of the field-magnet coils 6; The other terminals of thefield-magnet coils 6 are connected to conducting leads 16 that extendfrom the rear of the motor upwardly into the space 13 and insubstantiall parallel relation to the brush leads 12. T e circuitconnections of the motor are more clearly shown in Fig. 3, wherein theconductors 15 are shown connected to the supply main 17 of a suitabledirect-current or single-phase alternatingcurrent source, thearrangement of the brush leads 12 and of the field-coil leads 16 beingshown diagrammatically.

The portions of the leads 12 and 16 that are located in the space'13 areconnected together, in pairs, by means of suitable cylindricalconnectors 18 that are respectively surrounded by a'tube 19 ofinsulating material. The connectors 18 form no part of the presentinvention and are fully shown and described in a copending patentapplication, Serial No. 146,475, filed Feb. 3, 1917, b G. H. Garcelonand assigned to the Vaestinghouse Electric '& Manufacturing Company. Thecasing 1 is provided with an opening 20 that is located immediatelyabove the connectors 18 and is normally closed by a name plate2l securedto the casing by screws 22. The opening 20'is of suflicient length toallow the connectors 18 and a portion of the leads 12 and 16 to beWithdrawn from the casing 1 through the opening, as indicated in dottedlines.

From the foregoing, it .isapparent that, during the operation of themotor, the leads 12 and '16 are located entirely within the casing 1 sothat there is no possibility of the circuit-between the armature andfieldmagnet windings being interrupted, as would be the case if ortionsof the leads were located. outside 0 thecasing. If, how

necessary to remove the name plate 21, withdraw the connectors 18 andchange the relation of the leads 12with respectto the field coil leads16, after which the leads and connectors are returned to the space 13.

My arrangement of connections is also particularly advantageous when itis desired to test either the field-magnet coils or the armaturewindingfor grounds or for other electrical defects, without removing any ortionof the motor other than the name p ate.

While I have shown my invention in a simple and preferred form it is notso limited but is susce tible of various minor changes and niodi cationswithin the scope of the appended claims.

I claim as my invention:-

l. In a dynamo-electric machine, the combination with a magnetizablecore member provided with a recess therein and an inclosingcasingprovided with an opening adja cent said recess, of electric conductorsnormally located within said recess and having portions thereofremovable through said opening for altering the circuit connections ofsaid machine.

2. In an electric motor, the combination with relatively rotatablemagnetizable members the stator of which is provided with a recess inthe periphery thereof, armature and field-magnet windings carriedthereby, and an inclosing casing provided with an opening disposed inalinement with said recess, of leads from said field-ma net windingsconnected to leads from sai armature windings by means of connectorsdisposed within said recess removable through said opening for alteringthe connections formed thereby.

3. In a dynamo-electric machine, the combination with an inclosing.casing provided with an opening, a magnetizable core member disposedwithin said casing and having a portion thereof adjacent said openingcut away to form a recess, of a lurality of windings disposedwithin saidynamo-electric machine and having their ends disposed within the saidrecess and removable therefrom through the opening in said casing.

In testimony whereof, I have hereunto subscribed my name this 24th dayof Nov., 1916.

, JOEL R. COOK.

